//
// This file is part of cpp-lib, a library of C++ functions and classes.
// Cpp-lib is copyright (C) 2004 and onwards, The CPL Interest Group.
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2.1 of the License, or (at
// your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
// General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this library (see the file COPYING); if not, write to the
// Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
// 02111-1307  USA
//
// $Id$
//


#include <cmath>

#include "cpp-lib/sys/util.h"


using namespace cpl::util ;


double cpl::util::sleep_scheduler::wait_next() {

  double const n = ( this->time() - t_0 ) * hz ;

  if( n > n_next ) {   n_next = std::ceil( n ) ; } // Missed a slice.
  else             { ++n_next ;                  }

  assert( n_next >= n ) ;

  cpl::util::sleep( dt * ( n_next - n ) ) ;

  return t_0 + dt * n_next ;

}
